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Sherco Tech / Re: Sherco 2019 300 2t Wiring diagrams are blurry.
« Last post by EnzimaRacing on January 17, 2021, 03:01:39 PM »
There were some issues with the ECU on the 2019 models because the ECU was to close to the Ignition Coil (electromagnetism effect was driving ECU crazy).
Try to pull away the ECU and give another try. There is a video on tube explaining this issue in more detail.

Let us know if this helped.

Sherco Tech / Re: SE-R 300 Factory 2020 Randomly no spark and won't start
« Last post by EnzimaRacing on January 17, 2021, 02:55:43 PM »
Hello everybody!
Im also a Sherco rider and I love this machine! I think is the best ride I ever had for hard enduro and besides Im facing some ignition issues I would not change a bolt on that bike!  ;D

I thing my ignition issue is very similar to yours. My Sherco 300 SE Factory 2021 (20ART) doesn't start. I can see a single spark on the spark plug and nothing more (yes one spark only). I believe I have checked everything possible and I still didn't find the problem:
New Spark Plug;
Pull ECU far away from the ignition coil (magnetism effect known on 2019 models drives ECU crazy), 2021 models have already new rubber part on the ignition coil mount to increase the distance between both components;
Pick up coil checked and good;
Ignition coil - good (0,5 mOhm between + and -);
DC CDI - good (getting the 12V on the red wire and good ignition signal from ECU)
Stator good (3phase AC stator with  0,44ohm on Y1-Y2-Y3);
New Battery;
Diagnostic machine connected with no error issues.

One single spark is all I can get every 30 sec (I need to wait the ignition to turn off if I want to see one spark again).
Please share any in put you may have!

Classifieds / Re: 2020 300 factory 2T
« Last post by baker on January 17, 2021, 12:56:31 PM »
Sherco Tech / Re: decompressor starting issue
« Last post by erdat on January 17, 2021, 12:50:47 PM »
This might be a noob question, but how did you track the problem to a compression problem? What are/were the indication?
Sherco Tech / 2021 counter balanced 300 2T's
« Last post by 74ossaguy on January 17, 2021, 06:22:41 AM »
Hello, looking for feedback on the 2021 CB 2 stroke (300cc)motor and particularly how it compares to previous 300's.

Who can offer personal opinion comparisons????

I'm on a 2020 300 Factory.

Sherco Tech / Re: decompressor starting issue
« Last post by doh13 on January 16, 2021, 06:13:35 PM »
Another reply to my own topic :)  I have installed a new spring and the decompressor mechanism  seems to return with more force. I have not tested it yet but it seems as if the old spring may have gotten weaker due to heat, if it works its a  cheap enough part to change on each rebuild.
General Discussion / Re: 2020 starting issues
« Last post by alang on January 15, 2021, 06:08:00 PM »
Earthx etz5g works great
On my 17 300ser.
General Discussion / Dakar Results are in
« Last post by erdat on January 15, 2021, 03:26:03 AM »
Congratulation to Lorenzo Santolino on 6 position on the 2021 Dakar, very impressive result for Sherco, well done!
General Discussion / Re: 2020 starting issues
« Last post by eralha on January 15, 2021, 02:02:26 AM »
Yesterday bike started from the first press of the button in the warm, but while driving in temperature -11C, I hardly could restart the bike even when it stopped on the track, meaning straight after it was shut down. Current batteries are not old and another one is lead battery from Yuasa, but neither one does not work properly in cold. As there seems to be a pattern here, it's most probably either battery problem either charging problem. I try new battery next thing, even though current batteries shouldn't be so old..  :(

I think your main problem is with the battery, the ignition on this bikes need to have a battery working good, one time when my battert gone flat i tryed to bump start it with no success, even on a long downhill, it only worked with a jump starter, and when i would take out one of the wires of the jump starter the bike would die. So i can tell that thes bikes need to have power in the battery.

And the lithium battery are not good for cold weather, better try a lead acid battery.

General Discussion / Exhaust Alternatives for 300 sef
« Last post by jamracing on January 14, 2021, 06:06:46 PM »
Hey all - is it worth replacing the header/muffler on the 300? Anyone have dyno numbers to show the bigger headers like the fmf powerbomb?

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